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Bicharracosaurus dionidei
Taxonomy
Bicharracosaurus dionidei was named by Reutter et al. (2026). Its type specimen is MPEF-PV 1730, a partial skeleton (Partially articulated axial skeleton), and it is a 3D body fossil. Its type locality is Dionide 3 site, which is in an Oxfordian/Kimmeridgian fluvial sandstone/mudstone in the Cañadón Calcáreo Formation of Argentina. It is the type species of Bicharracosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2026 | Bicharracosaurus dionidei Reutter et al. p. 9 fig. 1 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Bicharracosaurus dionidei Reutter et al. 2026
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Reutter et al. 2026 | The new genus and species can be diagnosed by three unique autapomorphies
(denoted with an asterisk) and the following unique combination of characters: ventral surface of middle cervical centra with an anteroposterior short ridge in the posterior portion laterally bound by paired rounded fossae; ventrally bifurcated postzygodiapophyseal lamina in posterior cervical vertebrae; CDF in middle and posterior cervical vertebrae pierced by a triangular coel*; presence of a vertically oriented accessory lamina within the PRCDF in the posteriormost cervical vertebra; presence of several fossae along the ventral margin (or the PCDL) of the POCDF in middle cervical vertebrae; distal portion of the PODL with a small dorsally oriented protuberance in posteriormost cervical vertebrae*; presence of a prezygapophyseal fossa in middle cervicals; absence of pre-epipophyses in cervical vertebrae; SDF in middle cervical vertebrae pierced by several rounded coels; slightly opisthocoelous posterior dorsal centra; small fossa anteroventral to pleurocoel in middle to posterior dorsal vertebrae; parapophysis dorsal to prezygapophysis in middle and posterior dorsal vertebrae; accessory lamina of the parapophysis in middle to posterior dorsal vertebrae; divided SPDL in anterior dorsal vertebra; accessory lamina of the hyposphene; absence of aliform process in middle and posterior dorsal neural spines; posterior dorsal neural spines transversely narrower than anteroposteriorly long; boat-like articular facets of sacral centra*; second sacral rib with dual contribution from Sa1 and Sa2; ilium with a semi-horizontal preacetabular process. |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| References: Marsh 1875, Kiessling 2004 | |||||
Age range: Kimmeridgian or 154.80000 to 149.20000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian - Kimmeridgian | Argentina (Chubut) | Bicharracosaurus dionidei (type locality: 278612) | |
| Kimmeridgian | Argentina (Chubut) | Diplodocidae indet. (172899) |